Any of a large and diverse group of specialized complex marine gastropods previously united under Opisthobranchia within the Heterobranchia, characterized by two pairs of tentacles and a single gill behind and to the right of the heart.
The numerical value of opisthobranch in Chaldean Numerology is: 8
The numerical value of opisthobranch in Pythagorean Numerology is: 4
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"opisthobranch." Definitions.net. STANDS4 LLC, 2017. Web. 13 Dec. 2017. <http://www.definitions.net/definition/opisthobranch>.